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41.
D. Tillakhodzhaev M. U. Sadykov Yu. Yu. Lazauskas T. A. Sabirov F. P. Chumakov I. Taleikene 《Fibre Chemistry》1987,18(3):233-236
Conclusions Results of this research have shown the efficiency and economic advisability of using the method of reagent treatment of wastewater from the washing division of plants manufacturing triacetate yarns, with the objective of cleaning them up from A-1 lubricant.The economic benefit on introduction of the developed method for cleaning up wastewater from A-1 lubricant will be 351,000 rubles per year at the Kaunas plant and 102,000 rubles per year at the Engels plant.Translated from Khimicheskie Volokna, No. 3, pp. 53–55, May–June, 1986. 相似文献
42.
Method for reconstructing atmospheric optical parameters from the data of polarization lidar sensing
Inversion of polarization lidar sensing data based on the form of the lidar sensing equation with allowance for contributions from multiple-scattering calls for a priori information on the scattering phase matrix. In the present study the parameters of the Stokes vectors for various propagation media, including those with the scattering phase matrices that vary along the measuring range, are investigated. It is demonstrated that, in spaceborne lidar sensing, a simple parameterization of the multiple-scattering contribution is applicable and the polarization signal's characteristics depend mainly on the lidar and depolarization ratios, whereas differences in the angular dependences of the matrix components are no longer determining factors. An algorithm for simultaneous reconstruction of the profiles of the backscattering coefficient and depolarization and lidar ratios in an inhomogeneous medium is suggested. Specific features of the methods are analyzed for the examples of interpretation of lidar signal profiles calculated by the Monte Carlo method and are measured experimentally. 相似文献
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44.
Boris P. Tarasov Mikhail S. Bocharnikov Yurii B. Yanenko Pavel V. Fursikov Mykhaylo V. Lototskyy 《International Journal of Hydrogen Energy》2018,43(9):4415-4427
This work presents results of the experimental studies (XRD, SEM, PCT) of hydride forming intermetallides used in the first (LaNi5) and the second (La0.5Ce0.5Ni5) stages of industrial-scale metal hydride hydrogen compressor providing H2 compression from 3.5 to 150 atm with the productivity about 10 Nm3/h. During the operation, both materials underwent 18,180 hydrogenation/dehydrogenation (h/d) cycles which included H2 absorption at the pressure of 3.5 atm (LaNi5) and 35–38 atm (La0.5Ce0.5Ni5) at T = 15–20 °C followed by H2 desorption at the pressure of 35–38 atm (LaNi5) and 150 atm (La0.5Ce0.5Ni5) at T = 150–160 °C. It was found that the observed ~30% drop of the productivity of the compressor by the end of its operation is associated with a degradation of the first stage hydride material (LaNi5) under conditions specified above. The cycling resulted in the appearance of Ni and LaH2+x phases in addition to the parent intermetallide. In turn, the cycled LaNi5 exhibited more than 20% lower hydrogen storage capacity than the alloy at the beginning of the cycling; the cycling was also found to result in a noticeable sloping of initially flat plateau. Conversely, the degradation effects in La0.5Ce0.5Ni5 were found to be much less pronounced, in spite of the higher operating H2 pressures. The observed effect was associated with the decrease of thermodynamic driving force (TDF) of AB5 disproportionation in H2 when substituting La with Ce. 相似文献
45.
Yangkun He Gerhard H. Fecher Chenguang Fu Yu Pan Kaustuv Manna Johannes Kroder Ajay Jha Xiao Wang Zhiwei Hu Stefano Agrestini Javier Herrero-Martín Manuel Valvidares Yurii Skourski Walter Schnelle Plamen Stamenov Horst Borrmann Liu Hao Tjeng Rudolf Schaefer Stuart S. P. Parkin John Michael D. Coey Claudia Felser 《Advanced materials (Deerfield Beach, Fla.)》2020,32(45):2004331
The development of high-density magnetic recording media is limited by superparamagnetism in very small ferromagnetic crystals. Hard magnetic materials with strong perpendicular anisotropy offer stability and high recording density. To overcome the difficulty of writing media with a large coercivity, heat-assisted magnetic recording was developed, rapidly heating the media to the Curie temperature Tc before writing, followed by rapid cooling. Requirements are a suitable Tc, coupled with anisotropic thermal conductivity and hard magnetic properties. Here, Rh2CoSb is introduced as a new hard magnet with potential for thin-film magnetic recording. A magnetocrystalline anisotropy of 3.6 MJ m−3 is combined with a saturation magnetization of μ0Ms = 0.52 T at 2 K (2.2 MJ m−3 and 0.44 T at room temperature). The magnetic hardness parameter of 3.7 at room temperature is the highest observed for any rare-earth-free hard magnet. The anisotropy is related to an unquenched orbital moment of 0.42 μB on Co, which is hybridized with neighboring Rh atoms with a large spin–orbit interaction. Moreover, the pronounced temperature dependence of the anisotropy that follows from its Tc of 450 K, together with a thermal conductivity of 20 W m−1 K−1, make Rh2CoSb a candidate for the development of heat-assisted writing with a recording density in excess of 10 Tb in.−2. 相似文献
46.
Dirk H. Ortgies Francisco J. Teran Uéslen Rocha Leonor de la Cueva Gorka Salas David Cabrera Alexander S. Vanetsev Mihkel Rähn Väino Sammelselg Yurii V. Orlovskii Daniel Jaque 《Advanced functional materials》2018,28(11)
Magnetic nanoparticles (M:NPs) are unique agents for in vivo thermal therapies due to their multimodal capacity for efficient heat generation under optical and/or magnetic excitation. Nevertheless, their transfer from laboratory to the clinic is hampered by the absence of thermal feedback and by the influence that external conditions (e.g., agglomeration and biological matrix interactions) have on their heating efficiency. Overcoming these limitations requires, first, the implementation of strategies providing thermal sensing to M:NPs in order to obtain in situ thermal feedback during thermal therapies. At the same time, M:NPs should be modified so that their heating efficiency will be maintained independently of the environment and the added capability for thermometry. In this work, optomagnetic hybrid nanostructures (OMHSs) that simultaneously satisfy these two conditions are presented. Polymeric encapsulation of M:NPs with neodymium‐doped nanoparticles results in a hybrid structure capable of subtissue thermal feedback while making the heating efficiency of M:NPs independent of the medium. The potential application of the OMHSs herein developed for fully controlled thermal therapies is demonstrated by an ex vivo endoscope‐assisted controlled intracoronary heating experiment. 相似文献
47.
An organometallic approach was used to functionalize multiwalled carbon nanotubes with n-butyllithium. This procedure was repeated two more times to achieve a higher degree of multiwalled carbon nanotube functionalization. The functionalized nanotubes have been characterized by Fourier transform infrared and Raman spectroscopy, thermogravimetrical analysis, scanning electron microscopy and sedimentation studies. It was possible to form stable suspensions of the functionalized nanotubes in tetrahydrofuran and they were used to make nanotube polymer composites. The mechanical properties of these new nanotube polymer composites were tested and they were found to show an increase of up to 25% in their Young's moduli and up to 50% in their tensile strength over pure polystyrene. 相似文献
48.
Hernandez Y Nicolosi V Lotya M Blighe FM Sun Z De S McGovern IT Holland B Byrne M Gun'Ko YK Boland JJ Niraj P Duesberg G Krishnamurthy S Goodhue R Hutchison J Scardaci V Ferrari AC Coleman JN 《Nature nanotechnology》2008,3(9):563-568
Fully exploiting the properties of graphene will require a method for the mass production of this remarkable material. Two main routes are possible: large-scale growth or large-scale exfoliation. Here, we demonstrate graphene dispersions with concentrations up to approximately 0.01 mg ml(-1), produced by dispersion and exfoliation of graphite in organic solvents such as N-methyl-pyrrolidone. This is possible because the energy required to exfoliate graphene is balanced by the solvent-graphene interaction for solvents whose surface energies match that of graphene. We confirm the presence of individual graphene sheets by Raman spectroscopy, transmission electron microscopy and electron diffraction. Our method results in a monolayer yield of approximately 1 wt%, which could potentially be improved to 7-12 wt% with further processing. The absence of defects or oxides is confirmed by X-ray photoelectron, infrared and Raman spectroscopies. We are able to produce semi-transparent conducting films and conducting composites. Solution processing of graphene opens up a range of potential large-area applications, from device and sensor fabrication to liquid-phase chemistry. 相似文献
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